Yellow dyestuffs and process of making same.



{UNITED STATES PATENT ounce.

.HERMANNWAGNER m) JOSEF ERBE'R, or H'ooHsr-ou-THE-MMN, GERMANY, ASSIGN-ORS TO FARBWERKE VORM. METSTER LUCIUS '80 BRt NINe, or nocHsr-oN-rm'n-MAIN, GERMANY, A CORPORATION OF GERMANY.

YELLOW DYESTUFFS AND PROCESS OF MAKING SAME.

No Drawing.

- wherein X stands for a hydrogen or halogen atom'or for a nitro-,alkyl-' or alkyloxygroup; and Y for hydrogen, a methyl-0r 1carboxyl-g'roup. They are yellow to orange forwoolan silk-dyeingpowders, soluble in concentrated sulfuric.

acid to a yellow solution, insoluble in ether, benzene and carbontetrachlorid, difiicultly soluble in alcohol; owing to the excellentfast'ness they ossess, they are of great value as well as for thepreparation of'color-lakes- The preparation of the said new dyestuffsmay, for instance, be carried out accordingto the following examples:

Example I: The tetrazo compound produced in the usual-manner from 274.3kilos of diaminotriphenylmethane is run into an aqueous solution,prepared by means of caustic soda-lye and sodium carbonate, of 417 kilosof 1-(2-chlorphenyl) 3-methyl-5- p razolone. After the combination iscomp etc, the dyestufl" is isolated in theusual manner. The combinationmay also be effected in acetic acid solutio Example II: The tetrazocompound produced from 274 kilos of diaminotriphenylmethane is combinedwith asolution, alka- Specification of Letters Patent.

Patented Nov. 16, 1915.

' Application filed June 25, 1913. Serial No. 775,772.

line with sodium carbonate, of 577.5 kilos of 1'-(2-chloro-5-sulfophenyl) -3-metliyl-5- pyrazolone. After the combinationis com- 'plete, the dyestufl is salted out. Itis a yellow powder, andhas the constitutional formula:

1t dyes wool and silk pure yellow tints with a green hue, which areremarkable for their excellentfastness to milling and to the action oflight and sulfur.

Having now described our invention, what we claim is: l

1. The process of manufacturing yellow dyestuffs suitable for woolandsilk-dyeing and for the preparation of color-lakes, which consists incombining the tetrazo compounds of the diaminotriphenyl-methanes with pyrazolones.

2. As new articles of manufacture, thedyestufi's having the nucleus:

Ail'yl which dyestuffs are yellow to orange powders, soluble inconcentrated sulfuric acid with a yellow color, insoluble in ether,benuble inalcohol, and suitable for wool and silk-dyeing and for thepreparation of color lakes.

said-dyestuif bifig'; yellow powder, soluble in concentratedsulfuricacid with a yellow color, insoluble in ether, benzene and carbontetrachlorid, v difiicultly soluble in alcohol,

, tures in presence of for the preparation of color-lakes.

- 4c. The process of producing yellow disazo t 3 dyestulfswhich consists"in' combining the 3 As;- a -ne,w" art1cle "of manufacture, the

' methanes with pyra'zo'lones' tetrazo compounds of'the diaminotriaryl-5. As new. articles of manufacture, the

disazo jdyestuffshaving the nucleus 1 which dyestufis are in'the drystate yellowish powders, dyeing animal fibers greenish yellow to orangeyellow shades, and which yield on being reduced" adiaminotriary-lmethane compound andan aminopyrazolone. In testimonywhereof, we'aflix our signatwo witnesses.

BHLRLLANN WAGNER. JOSEF ERBER. WVitnesses':

JEAN GRUND, CAflRL GBUND.

